First time in ages had a quick high speed run (and before anyone goes on it was on a big track and I know that my engine is going to blow because scoobs and high speed don't mix..! ) anyhow, reaching around 6k in 5th for a few seconds I had to lift off quickly (end of runway..!. As soon as throttle was released my knocklink flicked to red (with possibly a very muffled pop from exhaust..?). Tried again a few miles after reaching ~5k, this time lifting a bit slower and nothing from KL and no noise.

Now I'm not really worried as this happend with the throttle closed so I don't think it's knock and maybe KL picked up a slight backfire.

Does this sound a sensible posibility or should I be concerned..?

Cheers,

Jason